package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不能交给spring进行管理,需要自己new,不能注入其他对象
    //不能实现数据库操作
    //手动注入
    private EduSubjectService subjectService;
    public SubjectExcelListener() {}
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData==null){
            throw new GuliException(20001,"文件数据为空!!!");
        }
        //一行一行读取,每次读取两个值,第一个值时一级分类,第二个值是二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject==null){
            existOneSubject=new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }
        String pid = existOneSubject.getId();
        //判断二级分类是否重复
        EduSubject existTowSubject = this.existTowSubject(subjectService, subjectData.getTowSubjectName(), pid);
        if (existTowSubject==null){
            existTowSubject=new EduSubject();
            existTowSubject.setParentId(pid);
            existTowSubject.setTitle(subjectData.getTowSubjectName());
            subjectService.save(existTowSubject);
        }

    }
    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTowSubject(EduSubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        EduSubject TowSubject = subjectService.getOne(wrapper);
        return TowSubject;
    }





    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
